Children Learning Language By Reading

Hi (apologies, I’m not sure if this is an appropriate place for this question)

I’m curious if there are any of you out there who learned a language almost purely by reading (ie. not a huge amount of contact with the language next to reading). I’ve been trying a lot of things to teach my daughters (8 & 10) Tamil. The problem is I’ve only been learning it for the last 5 years, and my level is still poor. Plus, we currently don’t have much access to the community (working on that). But they have managed to learn the script, and both of them can read decently. Of course I don’t wish to solely rely on this, but it’s also til now the one thing that has really worked. So I’m curious if anyone has experience from their youth or with their kids?

Thanks in advance